<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>

<script type="text/javascript">



var a = function(){};
var b = a;
b.c = 10;
/*
var c = new b();
c.a = 20;
alert(a.a);
*/
/*
var a = 10;
a.b = 20;
alert(a.b);
*/
/*
var a = function(){
	this.a=new Number(10);
	this.b=20;
	this.c=30;
	this.d= [1,2,3];
	this.a.a = 20;
	this.f = function(){
		alert(this.a);
		//return undefiend
	}
}
alert(new a().a.a);
*/

//alert(new a().f());
//new a().b();

//a();
//alert(typeof a);

</script>
</body>
</html>